<!doctype html>
<html lang="en">
 <head>
  <meta charset="UTF-8">
  <meta name="Generator" content="EditPlus®">
  <meta name="Author" content="">
  <meta name="Keywords" content="">
  <meta name="Description" content="">
  <title>Document</title>
 </head>
 <body>
  
 </body>
</html>
<script>
	//do while 先执行一次再进行验证
	//do{先执行一次}while(再判断条件);  不管怎么样都会先执行一次！！！

	var i = 0;
	do{
		console.log(i);
		i++;
	}while(i < 20);
</script>
